The car runs fine after it warms up? Is it running with the check engine light off? But it does come on with the key before the engine is started? If the coolant temperture senser is bad ( or disconnected someway) the check engine light will be on but the car might run OK at normal operating tempertures. Have the car checked for codes. It's OBDI so you might have to find a service provider that can ceck the codes on this pre OBDII car. If it turly runs good at normal operating tempertures and the transmission is'nt low on fluild then the coolant senser does'nt always turn the check engine light on if it's bad and still reading something but wrong. Truly running good and the coolant is full ( all the way). chage the senser and see what happens as thier cheap and easy to change with commn hand tools.
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